query: SELECT sum(tours) ,  ranking_date FROM rankings GROUP BY ranking_date
question: How tours total being there each a-ranking a date?
query_toks: SELECT sum ( tours ) , ranking_date FROM rankings GROUP BY ranking_date
query_toks_no_value: select sum ( tours ) , ranking_date from rankings group by ranking_date
question_toks: How tours total being there each a-ranking a date?